Xerox workcenter 4150 is making light copies. No error code, however, I replaced the toner. Still making light copies both when copying and printing from computer. Anyone have a solution?

SOURCE: My Xerox Copy centre C123 shows error code 124-315

Thats a weird one. The machine is detecting the wrong speeds.
Try this.

1. Enter Diagnostic Mode ( UI Diagnostic Mode).
2. At the Control Panel, press and hold the 0 key for 5 seconds, then press the Start button while still pressing the 0 key.
   
3. Press buttons 6, 7, 8, and 9 on keypad and press Confirm.
   
4. Press the Log In/Out button (button with Key symbol) on the Control Panel.
   
5. Select System Settings.
   
6. Select Common Settings.
   
7. Select Maintenance/Diagnostics.
   

• [700-600]
  
• [700-601]
  
• [700-602]
  

Testimonial: "Thankyou,and need more help. chose NVM read/write & enter value700-600, it shows 65000 current value what should i enter as new value?"

SOURCE: xerox 5305 copier excess toner

sounds like faulty drum cleaning blade,which is usually contained in the replacement drum module.I would be inclined to take the drum unit back where you got it (unless you replaced it with a second-hand one) 99% certain the problem is contained in that module

SOURCE: Xerox XC820 Copy Machine

three lights are for paper jam, replace toner cartridge and replace dru, cartridge. If there is zigzag line it is paper jam if there are six small dots it is for toner cartridge and if it is one circle it is for copy cartdisge. You can contact me for mfurther support at [email protected]

SOURCE: Xerox 7232 and As400

016-799 is a printer paper conflict error. All you have to do for the AS/400 to print, is to make suree that tray 2 in the printer is set up to do landscape printing. There has to be at least one tray for portrait, and one for landscape in order for the AS/400 to print.

SOURCE: B&W Xerox copier XC23 has code J7 and will not print

This machine has a battery on the main board. The battery might failed, they will last for about 7 years. When the battery fails then so will the NVM.
Some NVM information can get garbled. This problem may be associated with it.
Some of the values can be checked and changed in diagnostics, most cannot.

If you replace the drum and the machine will not reset, replacing the main board may fix the problem. Make sure the connector on the back of the machine does connect to the copy cartridge.
Sometimes the cartridge you recieve is for a different model. (5322 family)
The socets may not match.
I really do not like to see you spend your money on drums if it does not fix the problem on the machine. Hold on to the drum units until you really find the source of the problem.
Good luck.